I would go with the electrician in this case. A warm wire leading to the water heater sounds like a problem. Replacing breakers in a panel for a two phase (220) setup requires that the breaker is in the proper slot. Sometimes one notch up or down will not work.

Note: If the power was turned on before the new tank was completely full, (water needs to be running from a faucet long enough to let "all" the air out) can cause the upper element to burn out (takes seconds) and should be checked. Terry

: Last Sunday, I got up to no hot water. Had no way of knowing how old mine was but knew the element had been replaced 3 years ago. Changed the element but the gasket around it was eaten up...bought a new hot water heater from Sears. Finally got it installed. Still have no hot water. Did finally find that the breaker was kicking off and the electric wire was very warm leading to the tank. Bought a new electric breaker. Also had to switch the wiring on the hot water heater...that was wrong and not the breaker. Still have no hot water. Breaker is not tripping now and the electric wire is not warm anymore. Have hit reset button to no avail. Have temo set on thermostat to 140 degrees. : My main question is do I need a plumber or do I need an electrician??? : Please help ASAP. Thanks!